1) xₙ = 3n² + 1
x₁ = 3 * 1² + 1 = 3 + 1 = 4
x₅ = 3 * 5² + 1 = 3 * 25 + 1 = 76
2) y₁ = - 3 yₙ₊₁ = 2yₙ + 5
y₂ = y₁₊₁ = 2y₁ + 5 = 2 * (- 3) + 5 = - 6 + 5 = - 1
y₃ = y₂₊₁ = 2y₂ + 5 = 2 * (- 1) + 5 = - 2 + 5 = 3
3)
1) xₙ = 3n² + 1
x₁ = 3 * 1² + 1 = 3 + 1 = 4
x₅ = 3 * 5² + 1 = 3 * 25 + 1 = 76
2) y₁ = - 3 yₙ₊₁ = 2yₙ + 5
y₂ = y₁₊₁ = 2y₁ + 5 = 2 * (- 3) + 5 = - 6 + 5 = - 1
y₃ = y₂₊₁ = 2y₂ + 5 = 2 * (- 1) + 5 = - 2 + 5 = 3
3)